Spring lettuce is generally planted in the middle of November in the size of the seedlings have been fastened in the film of the greenhouse, the spacing of 25 cm 30 cm, in mid-February can be listed. Its cultivation techniques are as follows: First, temperature and humidity management. In the initial stage of colonization, attention should be paid to ventilation and dehumidification. When the temperature is above 0°C at night, ventilation is required. When the temperature is below 0°C, a small arch shed is to be covered and covered with straw. During the day, the straw curtain is opened. When the stem begins to expand until harvesting, the greenhouse temperature is 15-20°C during the day, ventilation is over 24°C, and should not be lower than 5°C at night. Second, fertilizer and water management. After planting should be enough water to stabilize the roots, 5-6 days after the seedlings are slowly sloping seedlings, while raising the seedlings with water, Mushi ammonium sulfate 10-15 kg, after continuous cultivating loose soil 2-3 times. At the beginning of the mission, the fertilizer was topdressed once with water, and 20 kg of ammonium sulphate was applied. Then the cultivator and seedlings were continued. When the stem begins to swell, timely watering, with the water Mu chase 3 yuan compound fertilizer 25-30 kg. Afterwards, keep the soil moist. Third, disease prevention and control. In the early stage of onset, 25% metalaxyl MnZn wettable powder 800-900 times liquid and 50% quick-inking wettable powder 1500 times, or 50% carbendazim suspension 500-600 times liquid spray 2— 3 times (spray once every 7 days). Fourth, harvest. The best harvest time is when the tip of the main stem is at the same time as the tips of the tallest leaves. In order to be listed on the market in advance, it can be adopted as early as possible, with large income and small stocks listed in batches. China Agricultural Network Editor
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